"My Son the Vampire" and "Dark Eyes of London" are British films. Consider British copyright law before assuming that they're public domain; my recollection is that "My Son the Vampire" has been established as under copyright.
You are right re "My Son the Vampire". However, The film on the list is "Dead Eyes of London" which is a German 'krimi' remake of "The Dark Eyes of London"/"Human Monster". While it is also still under copyright, its a different film.